225138 has 16 divisors (see below), whose sum is σ = 455040. Its totient is φ = 74256.

The previous prime is 225133. The next prime is 225143. The reversal of 225138 is 831522.

It is an interprime number because it is at equal distance from previous prime (225133) and next prime (225143).

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (225133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 823 + ... + 1061.

It is an arithmetic number, because the mean of its divisors is an integer number (28440).

2²²⁵¹³⁸ is an apocalyptic number.

225138 is an abundant number, since it is smaller than the sum of its proper divisors (229902).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

225138 is a wasteful number, since it uses less digits than its factorization.

225138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401.

The product of its digits is 480, while the sum is 21.

The square root of 225138 is about 474.4870914999. The cubic root of 225138 is about 60.8344521385.

It can be divided in two parts, 225 and 138, that added together give a palindrome (363).

The spelling of 225138 in words is "two hundred twenty-five thousand, one hundred thirty-eight".